Speed Reading with Spritz App

I stumbled across this new speed reading app in development called Spritz.  If you follow that link, you can test your own speed reading abilities at different speeds.  I can see all of the words at 600 words per minute, but my comprehension goes down.  According to Spritz, 400 wpm is my sweet spot for reading comprehension - for now.  I'm sure you get better the more you use it, but it's still in development and scheduled for release next week.  If my Kindle can utilize this app, I would be able to read twice as much in half the time.  That's a game changer.